A satoshi (abbreviated “sat”) is the smallest indivisible unit of Bitcoin, equal to 0.00000001 BTC — one hundred-millionth of one Bitcoin. Named after Bitcoin’s pseudonymous creator Satoshi Nakamoto, sats are widely used when discussing Bitcoin micropayments, Lightning Network balances, and increasingly in Bitcoin Ordinals culture where individual sats are inscribed with data or assigned rarity.
The Units of Bitcoin
Bitcoin is divisible to 8 decimal places:
| Unit | BTC equivalent | Common use |
|---|---|---|
| Bitcoin (BTC) | 1.00000000 | Large holdings, institutional |
| Millibitcoin (mBTC) | 0.00100000 | Rare |
| Bit (μBTC) | 0.00000100 | Rare |
| Satoshi (sat) | 0.00000001 | Lightning, ordinals, micropayments |
Why Sats Matter
At Bitcoin’s current prices, individual Bitcoin are expensive — over $50,000–$100,000+ depending on cycle. Denominating in sats makes Bitcoin more approachable for everyday transactions:
- “You owe me 10,000 sats” ($5 worth) is clearer than “0.0001 BTC”
- Lightning Network payments are naturally denominated in sats and millisats (1/1000 of a sat)
“Stack sats” is a popular slogan in the Bitcoin community — encouraging accumulation of sats over time through dollar-cost averaging.
Sats and Ordinals
The Bitcoin Ordinals protocol (2023–) assigned numbering to individual satoshis in the order they were mined. This created:
- Ordinal inscriptions: Embedding data (images, text, code) on specific sats
- Rare sats: Satoshis mined in special circumstances (first of a block, first of a halving) became collector items
- BRC-20 tokens: Token standard built on inscribed sats
Sat Stacking Culture
“Stacking sats” refers to the practice of regular, small Bitcoin purchases:
- Apps like Strike and Cash App promote sat accumulation
- Lightning tipping and payouts send sats for small content interactions
- “1 billion sats” (10 BTC) is an aspirational goal for Bitcoin enthusiasts
Historical Note
Satoshi Nakamoto’s identity remains unknown. The name “satoshi” was adopted naturally by the Bitcoin community as the smallest unit — a tribute to the founder regardless of WHO Satoshi is.
Sources
- Bitcoin whitepaper: bitcoin.org/bitcoin.pdf
- Lightning Network protocol specs
- Ordinals documentation: docs.ordinals.com